Blue Ash, Ohio Air Quality
Blue Ash has a median AQI of 54, earning an air quality grade of B — good air quality that ranks better than 5% of US cities. Air quality has remained relatively stable over the past decade. Particulate matter (PM2.5) is the primary concern, often linked to vehicle traffic, industrial activity, and wildfire smoke. In 2025, Blue Ash recorded 88 good air quality days (32% of monitored days) and 13 unhealthy days.
Population: 13,455 • County: Hamilton
Current AQI
Quick Facts
| Current AQI | 18 — Good |
| Air Quality Grade | B |
| Median AQI (2025) | 54 |
| vs. U.S. Cities | Better than 5% |
| Primary Pollutant | PM2.5 |
| Unhealthy Days/Year | 13 |
| 10-Year Trend | → Stable |
| Data Source | EPA AQS (historical) · AirNow (live) |
Health Recommendation
Air quality is satisfactory, and air pollution poses little or no risk.
It's a great day to be active outside!
5-Day AQI Forecast
Last 90 Days
Current Pollutant Levels
Real-time data from EPA AirNow
Local Air Quality Context
Air quality data for Blue Ash is sourced from the Sycamore monitoring area, located approximately 2 miles from city center. This EPA-certified station continuously tracks particulate matter (PM2.5), the primary driver of air quality alerts in this area.
Blue Ash tends to see elevated PM2.5 readings during fall and winter months when temperature inversions trap pollutants near the surface. Wood burning, vehicle exhaust, and reduced wind speeds compound the effect. Residents with respiratory conditions should monitor forecasts closely between November and February.
AQI Trend (10 Years)
Air Quality Days by Year
Blue Ash Median AQI by Year
Annual EPA air quality data for Blue Ash — median AQI, day-category breakdown, and primary pollutant per year.
| Year | Median AQI | Good Days | Unhealthy Days | Max AQI | Primary Pollutant |
|---|---|---|---|---|---|
| 2025 | 54 | 88 | 13 | 154 | PM2.5 |
| 2024 | 52 | 164 | 11 | 140 | PM2.5 |
| 2023 | 54 | 129 | 19 | 193 | PM2.5 |
| 2022 | 54 | 125 | 4 | 151 | PM2.5 |
| 2021 | 56 | 109 | 5 | 140 | PM2.5 |
| 2020 | 55 | 105 | 7 | 126 | PM2.5 |
| 2019 | 57 | 99 | 6 | 119 | PM2.5 |
| 2018 | 57 | 97 | 8 | 159 | PM2.5 |
| 2017 | 55 | 118 | 5 | 129 | PM2.5 |
| 2016 | 55 | 118 | 12 | 140 | PM2.5 |
Source: EPA Air Quality System (AQS) annual summaries. "Unhealthy Days" includes Unhealthy for Sensitive Groups, Unhealthy, Very Unhealthy, and Hazardous categories.
2025 Air Quality Summary
Primary Pollutant Days (2025)
Days when each pollutant was the primary driver of AQI. Learn about pollutants →
Frequently Asked Questions About Blue Ash Air Quality
What is the air quality in Blue Ash today?
The current AQI in Blue Ash is 18, rated "Good". Air quality is good — outdoor activity is safe for everyone today. Air quality is satisfactory, and air pollution poses little or no risk.
Is air quality in Blue Ash getting better or worse?
Air quality in Blue Ash has been stable. The median AQI has dropped 1 points (from 55 in 2016 to 54 in 2025).
What is the most common air pollutant in Blue Ash?
PM2.5 is the primary air pollutant in Blue Ash, responsible for 182 days (66% of monitored days) in 2025. Particulate matter originates from vehicle exhaust, wildfires, construction, and industrial activity.
How many unhealthy air days does Blue Ash have per year?
In 2025, Blue Ash recorded 32% good air quality days (88 days) out of 274 monitored days. There were 12 Unhealthy for Sensitive Groups days and 1 Unhealthy days (AQI above 100). The highest single-day AQI recorded was 154.
What air quality grade does Blue Ash receive?
Blue Ash receives an air quality grade of B, placing it better than 5% of US cities. This is based on a median AQI of 54 in 2025, with 88 good air quality days. The EPA monitors air quality in this area continuously using certified monitoring stations.
Air Quality Grade
Better than 5% of US cities
Nearby Cities
Protect Your Health
With a median AQI of 54, indoor air purification is recommended
See Recommended Purifiers ↓Get AQI Alerts
Receive notifications when air quality changes in Blue Ash
National Rankings
See how Blue Ash compares to every other US city by air quality.
Best Air Quality Cities →All city rankingsRecommended Air Purifiers for Blue Ash
Blue Ash sees its worst PM2.5 during winter temperature inversions when particulates get trapped near ground level. A unit with True HEPA and an auto-mode sensor is most effective for responding to these spikes.
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Blueair Blue Pure 211+
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